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RCC Structures Design - Engineering

Q1:

If p is the net upward pressure on a square footing of side b for a square column of side a, the maximum bending moment is given by

A

B

C

D

ANS:C -

The maximum bending moment on a square footing supporting a square column can be determined using the equation for the bending moment caused by a distributed load. The net upward pressure (p) on the square footing is acting over the entire area of the footing. This distributed load creates a moment about the center of the footing. The maximum bending moment (M_max) occurs at the corners of the footing where the moment arm is the greatest. Since the footing is square, the maximum moment occurs at the corners. The formula for the maximum bending moment (M_max) on a footing supporting a square column is given by: Mmax​=p⋅a2/4​ Where:

  • Mmax​ = Maximum bending moment
  • p = Net upward pressure on the footing
  • a = Side length of the square column (equal to the side length of the square footing)
This formula represents the maximum bending moment that occurs at the corners of the square footing due to the distributed pressure from the column.